Custom drag image with NSTableView as drag source -

is necessary subclass nstableview or nstablecellview create custom drag image when tableview drag source?

if not, magic method missing this? cannot seem find solid.

nstablecellview subclasses have can (slightly mysteriously) override:

@property(retain, readonly) nsarray *draggingimagecomponents (array of nsdraggingimagecomponent instances composited (who knows in fashion composited...))

nstableview has

- (nsimage *)dragimageforrowswithindexes:(nsindexset *)dragrows tablecolumns:(nsarray *)tablecolumns event:(nsevent *)dragevent offset:(nspointpointer)dragimageoffset

but these indeed subclassing options seems.

anybody know technique here? (10.8+ target )

it looks if nstableviewcell

@property(retain, readonly) nsarray *draggingimagecomponents 

does not called automatically must explicitly referenced view based table views. -draggingimagecomponents can overridden supply components used composite drag image.

- (void)tableview:(nstableview *)tableview draggingsession:(nsdraggingsession *)session willbeginatpoint:(nspoint)screenpoint forrowindexes:(nsindexset *)rowindexes {     // configure drag image     // dragging 1 item - changes required handle multiple drag items     bppopupbuttontablecellview *cellview = [self.columnstableview viewatcolumn:0 row:rowindexes.firstindex makeifnecessary:no];     if (cellview) {          [session enumeratedraggingitemswithoptions:nsdraggingitemenumerationconcurrent                                            forview:tableview                                            classes:[nsarray arraywithobject:[nspasteboarditem class]]                                      searchoptions:nil                                         usingblock:^(nsdraggingitem *draggingitem, nsinteger idx, bool *stop)          {              // can set drag image directly              //[draggingitem setdraggingframe:nsmakerect(0, 0, mywidth, myheight) contents:myfunkydragimage];               // tableview grab entire table cell view bounds image default.              // can override nstablecellview -draggingimagecomponents              // defaults including image , text fields              draggingitem.imagecomponentsprovider = ^nsarray*(void) { return cellview.draggingimagecomponents;};          }];     } }